Any hard wax based product will work, as has been posted already, to keep zippers lubricated and working well.
Here's a related question. What about when the zipper is rigidly stuck. Had some like that when we bought the boat. I used a VERY small amount of WD40 right into the zipper and it worked like a charm. I was concerned of staining, but was able to keep it off the fabric. Was there a better product i could have used?
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